[Indicators of collective immunity to influenza depending on the blood group and sex of the population].

Immunological investigations of the time course of serum anti-HA and anti-NA antibodies against influenza A and B viruses in the female and male population with blood groups 0(I), A(II), B(III), and AB(IV) were carried out for several months. The persons with the blood group AB (IV) were shown to be most sensitive to influenza A and B. They were affected by the epidemic virus earlier and more severely than those with the other blood groups. A special method is proposed for prediction of the etiology of the forthcoming epidemic. A correlation between blood groups and titres of anti-HA but not anti-NA antibodies was observed. The view on the lack of the genetic factor influence on the affliction with influenza and antibody response in persons of different sexes is substantiated.